Glass panel unit, glass window provided with same, and method for manufacturing glass panel unit

Abstract

A glass panel unit includes: a first panel; a second panel facing the first panel; a sealing member bonded to respective facing peripheral portions of the first panel and the second panel; and at least one spacer provided in a reduced pressure space between the first panel and the second panel. The at least one spacer includes a resin body and at least one ultraviolet protective layer provided on a surface of the resin body.

The invention claimed is: 
     
       1. A method for manufacturing a glass panel unit which includes:
 a first panel including at least a first glass plate; 
 a second panel facing the first panel and including at least a second glass plate; 
 a sealing member formed in a frame shape and bonded hermetically to respective facing peripheral portions of the first panel and the second panel; and 
 at least one spacer provided in an inner space between the first panel and the second panel, 
 wherein the inner space being a reduced pressure space, 
 the at least one spacer including a resin body and at least one ultraviolet protective layer provided on a surface of the resin body, and 
 the spacer being formed by punching a composite sheet including a resin sheet and the ultraviolet protective layer formed either on one surface or on both surfaces of the resin sheet, 
 the method comprising: 
 a composite sheet forming step of forming the ultraviolet protective layer on at least one surface of the resin sheet; 
 a spacer forming step of forming a plurality of spacers by punching the composite sheet including the resin sheet and the ultraviolet protective layer; 
 a spacer arrangement step of arranging the plurality of spacers between a first substrate including at least a first glass substrate and a second substrate including at least a second glass substrate; 
 a glass adhesive disposing step of disposing a glass adhesive in a frame shape between the first substrate and the second substrate; 
 an evacuation step of evacuating a space located between the first substrate and the second substrate and surrounded with the glass adhesive; and 
 a bonding step of bonding the first substrate and the second substrate together with the glass adhesive in the shape of the frame. 
 
     
     
       2. A method for manufacturing a glass panel unit which includes:
 a first panel including at least a first glass plate; 
 a second panel facing the first panel and including at least a second glass plate; 
 a sealing member formed in a frame shape and bonded hermetically to respective facing peripheral portions of the first panel and the second panel; and 
 at least one spacer provided in an inner space between the first panel and the second panel, 
 wherein the inner space being a reduced pressure space, 
 the at least one spacer including a resin body and at least one ultraviolet protective layer provided on a surface of the resin body, and 
 the spacer being formed by punching a composite sheet including a resin sheet and the ultraviolet protective layer formed either on one surface or on both surfaces of the resin sheet, 
 the method comprising: 
 a composite sheet forming step of forming the ultraviolet protective layer on at least one surface of the resin sheet; 
 a spacer forming step of forming a plurality of spacers by punching the composite sheet including the resin sheet and the ultraviolet protective layer; 
 a step including disposing a glass adhesive in a frame shape on a peripheral portion of a surface of a first substrate including at least a first glass substrate, and arranging the plurality of spacers in a space surrounded with the glass adhesive; 
 a substrate arrangement step of arranging a second substrate including at least a second glass substrate to allow the second substrate to face the surface of the first substrate on which the glass adhesive is disposed; 
 an evacuation step of evacuating a space located between the first substrate and the second substrate and surrounded with the glass adhesive; and 
 a bonding step of bonding the first substrate and the second substrate together with the glass adhesive in the shape of the frame.